se_ctrladdr_un
strlcpy(sep->se_ctrladdr_un.sun_path,
sizeof sep->se_ctrladdr_un.sun_path);
sizeof sep->se_ctrladdr_un.sun_path) {
sep->se_ctrladdr_un.sun_family = AF_UNIX;
1 + sizeof sep->se_ctrladdr_un.sun_family;